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userID 의 값 = "abc" | |
useridTr 의 값 = "abc" | |
==연산자로 비교를 했더니 계속 false가 나오는 것 | |
userID == useridTr -> false | |
userID.equals(useridTr) -> true | |
equals -> 내용을 비교 | |
==연산자 -> 주소값을 비교 |